linux-kernel - Re: [PATCH] cxl: Fix refcount leak in cxl_calc_capp

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Date:   Tue, 14 Jun 2022 20:12:48 +1000
From:   Andrew Donnellan <ajd@...ux.ibm.com>
To:     Miaoqian Lin <linmq006@...il.com>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Lombard <clombard@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cxl: Fix refcount leak in cxl_calc_capp_routing

On Sun, 2022-06-05 at 10:00 +0400, Miaoqian Lin wrote:
> of_get_next_parent() returns a node pointer with refcount
> incremented,
> we should use of_node_put() on it when not need anymore.
> This function only calls of_node_put() in normal path,
> missing it in the error path.
> Add missing of_node_put() to avoid refcount leak.
> 
> Fixes: f24be42aab37 ("cxl: Add psl9 specific code")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Thanks!

Acked-by: Andrew Donnellan <ajd@...ux.ibm.com>

> ---
>  drivers/misc/cxl/pci.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
> index 3de0aea62ade..62385a529d86 100644
> --- a/drivers/misc/cxl/pci.c
> +++ b/drivers/misc/cxl/pci.c
> @@ -387,6 +387,7 @@ int cxl_calc_capp_routing(struct pci_dev *dev,
> u64 *chipid,
>         rc = get_phb_index(np, phb_index);
>         if (rc) {
>                 pr_err("cxl: invalid phb index\n");
> +               of_node_put(np);
>                 return rc;
>         }
>